Improvement in furnaces



L. SOLOMON.

Furnace for Roasting Ores.

No. 24,828. Patented .July 19, 1859.

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UNITED STATES i PATENT OEEICE.

LEWIS SOLOMON, OF NEV YORK, N. Y.

IMPROVEMENT IN FURNOES.

Spccicationfornling part of Letters Patent No. 24,828, dated July 19,1859.

To all whom it may concern.-

Be it known that I, LEWIS SOLOMON, of New York, in the county and Stateof New York, have invented a new and Improved Furnace for Roasting andDesulphurizing Orcs; and I do hereby declare that the following is afull,

, clear, and exact description thereof, reference being had to theaccompanying drawings, through letters of reference marked thereon,forming part of this specification, in which* Figure l represents anisometrical view of my furnace, Fig. 2, a longitudinal section, and Fig.3 a transverse section, of the same.

The same letters of reference occurring in the several figures indicatecorresponding parts.

My invention consists in constructing a furnace in such manner .that theheat and iiame from the fire shall pass first under and then over alayer of the pulverized ore, which is tion, I will proceed to describeits construcv tion and operation.

rIhe furnace is built of brick or other suitable material, in formsimilar to that represented in the drawings7 Fig. l, in which Arepresents the fire-place; B, the grate-bars; C, the hre-door; D, theash-pit, and E the flues under the sole F of the roasting-chamber G; O,the flue-passages into the chimney H. I represents a chamber in the baseof the chimney, and Q the door or entrance to the same. J is acompartment under the center of the roasting-chamber, into which theroasted ore is discharged through an opening, K, in the sole F, whichopening may be closed by a trap-piece, T, and the compartment providedwith a door, S. L represents the arch or other covering of theroasting-chamber G, and which is provided with a funnel-shaped aperture,M, at or near its center, for the introduction of the pulverized ore,and which is closed by a sliding bottom, N. l? P P P PW are doorsarranged on two sides of the roasting-chamber G, to afford anopportunity to stir the ore thoroughly during the process of roasting. Ris a box to be placed in the compartment J as a receptacle for theroasted ore. U is a damper in the chimney to regulate the draft of thefurnace. Plugs W are arranged at the end to afford access to the iluesfor the purpose of n Y `cised in the management of the furnace, so thattoo high a degree of heatshall not be brought to act upon the ore, assuch would result in volatilizing a portion of the precious metals andin driving it off through the chimney. It may, however, be graduallyincreased as the process advances without fear of incurring such loss,for the more effectual and thorough completion of the process; but asthere will still be a portion of the precious metals volatilzed,notwithstanding the utmost care that may be exercised in the regulationof the heat during the process of roasting, and as the density'of theparticles will gradually increase the farther they recede from theaction of the fire and near the cooling iniiuence of the atmosphere, andthat to an extent sufiicient to overcome the upward-propelling force ofthe'rarefled air, 85e., and hence by virtue of their increased specificgravity be precipitated to the bottom of the chimney, I there arrange achamber, I, for their reception, and for the reception of other heavyand extraneous particles that may be driven off from the ore by the heatof the furnace, whose specific gravity is too great to be expelled fromthe chimney by the ascent of the heated air, smoke, sulphurous andmuriatic vapors, 83e., which result from the process, from which, faterthe process is completed, or when a large amount has accumulated, it maybe recovered by opening the door S ink the bottom of the chimney I, andtreated in any suitable manner for the reclamation of the preciousmetals. For the purpose of carrying these instructions into effect, thedoors P P', 85e., are occasionally opened and the ore stirred to preventtoo rapid an accumulation of heat, especially dur` ing the irst part ofthe process, after which, however, there will be less necessity forsuch, as the temperature can then be gradually raised to a much higherdegree of heat, and there maintained until all the sulphurous andmuriatic orV hydrochloric vapors have been expelled, a damper, U, beingarranged in the chimney, by inaens` of which the temperature of theroasting-chamber can be raised or lowered, as desired.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

So constructing a desulphurizing-fur1iace for- .the furnace andafterward on the surface of the ore, when the saine is combined With achamber arranged in the base of the chimney for the reception of suchvolatilized particles of ore, 85e., as may be ldriven off by heat orcarried over by the draft, substantially as described.

In testimony whereof I have hereunto set my hand, before two subscribingwitnesses, this 27th day of April, A. D. 1859.

itnwisY SOLOMON.

NVitnesses:

DANL. SErXAs, JosErH SOLOMON.

